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• <br />MINE ZD f OR PROSPECTING ID / <br />INS PIiCTION DATE 2/28/95 <br />(Page 3) • <br />M-94-117 <br />INSPECTOR'S INITIALS ACS <br />The t:arm "normal freeboard" is defined ae the difference in elevation between the low point <br />on the treat of the dam, and the high point on the tailing surface. The U.S. Bureau of <br />Recl:unation (BOR) recommends normal freeboard for a facility ouch as the Gold Hill <br />impoundment be established at 6 feet. The term "minimum freeboard" is defined as the <br />difference in elevation between the low point on the crest of the dam and the maximum <br />reservoir water surface that would result should the inflow design flood occur and the outlet <br />works function as planned. BOR recommends minimum freeboard for a facility ouch ae the Gold <br />Hill impoundment be established at 4.5 feet. (BOR recommendations from BOR Water Resources <br />Technical Publication "Design of Small Dame"). A Hine Safety and Health Administration <br />(MSH]\) inspector that visited the site during August of 1994 recommended a minimum freeboard <br />of 3 feet - this would be acceptable to the Division if the storm inflow analysis neglected <br />the possible usefulness of the decant standpipes to diminish storm flows. Using the MSHA <br />recommendation, a normal freeboard of 4 feet would be acceptable, eo the goal for the <br />applicant to bring the freeboard issue into compliance, would be to develop a plan for <br />Division review and approval, and implement the plan such that 4 feet of normal freeboard ie <br />in p:Lace by June 14, 1995. <br />cc: Carl Mount, DMG <br />Bill York-Feirn, DMG <br />Mark Steen <br />Mi Vida Enterprises, Inc. <br />P.O. Box 1523 <br />Longmont, CO 80502 <br />Mark Sprague <br />Boulder County Land Use <br />P.O. Box 471 <br />Boulder, CO 60306 <br />Susan Martino <br />Boulder County Health Dept. <br />3450 Broadway <br />Boulder, CO 80304 <br />Bob Mason <br />Gold Hill Town Meeting, Inc. <br />P.O. Box 7060 <br />Boulder, CO 80306 <br />Evan Freirich <br />1577 Gold Run Rd. <br />Boulder, CO 80302 <br />Doug Parker <br />P.O. Box 1077 <br />Boulder, CO 80306 <br />I & E: Contact Address <br />NAME Mr. Thames Hartley <br />OPERF~TOR Colina Oro Molina. Inc. <br />STREET P.O. Box 17304 <br />CITY/STATE/ZIP Boulder. CO 80308-0304 <br />~ CE <br />~ BL <br />~ FS <br />^ HW <br />~ HMWMD (CH) <br />~ SE <br />^ WQCD (CH) <br />g OTHER <br />